CN101242158B - A configurable and reconstructable dynamic frequency mixer - Google Patents

A configurable and reconstructable dynamic frequency mixer Download PDF

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Publication number
CN101242158B
CN101242158B CN200810047029XA CN200810047029A CN101242158B CN 101242158 B CN101242158 B CN 101242158B CN 200810047029X A CN200810047029X A CN 200810047029XA CN 200810047029 A CN200810047029 A CN 200810047029A CN 101242158 B CN101242158 B CN 101242158B
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China
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frequency
conversion
signal
switch
configuration control
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CN200810047029XA
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Chinese (zh)
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CN101242158A (en
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刘政林
邹雪城
蔡梦
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武汉芯泰科技有限公司
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Abstract

The invention discloses a reconfigurable dynamic mixer for a transceiver in the filed of analog integrated circuit of radio frequency analog front end. The mixer can be adopted for various frequency bands, to accomplish the following three structures of single frequency conversion, double frequency conversion, and non-frequency conversion. The upper switch for controlling parallel connection with the mixer turns on and off to accomplish various frequency conversion structures. The invention can take full advantage of various frequency conversion structures and avoid disadvantage thereof. The invention can supply the following three modes of non-frequency conversion, single frequency conversion, and double frequency conversion to process signal frequency through controlling different local frequency supplied by external frequency synthesizer, and transmit the signal frequency to the next block construction, so as to accomplish three different modes of frequency conversion. The invention supports various protocols and supplies processing of all frequencies in 0-11GHz frequency band. The invention supplies good foundation for radio frequency front end design in the protocol for more and more compatibility required in wireless communication system.

Description

A kind of dynamic frequency mixer of configurable and reconstructable
Technical field
The present invention relates to the rf analog front-end field of analog integrated circuit, i.e. frequency mixer in the transceiver is specifically related to a kind of dynamic frequency mixer of configurable and reconstructable.
Background technology
Along with the develop rapidly of wireless communication technology, mobile communication flourish.The market prospects of FRIP nuclear will become very wide, and global semiconductor and electronic system manufacturing company have all dropped into huge manpower and fund is carried out the exploitation of wireless communication system, and frequency mixer is wherein important part.
Frequency mixer comprises up-conversion mixer and down-conversion mixer.Exactly concrete: the lower frequency band of moving the radiofrequency signal linearity, pass in the base band, be convenient to the down-conversion mixer of Base-Band Processing; The analog signal that lower band signal linearity in the base band is moved a high frequency band is convenient to the up-conversion mixer of simulation part divisional processing.
Frequency mixer is one of important part of communication system, obtaining certain progress aspect the research of frequency mixer both at home and abroad in recent years, at transmitting terminal, up-conversion mixer will be loaded with the low frequency of useful signal or intermediate-freuqncy signal and be mixed to radio frequency by frequency mixer and export.Like this, just avoided output because the difficult problem that the low frequency signal wavelength long transmitting antenna that causes can't mate and better utilization frequency spectrum resource.In like manner, at receiving terminal, down-conversion mixer is converted into low frequency signal again with the high-frequency signal that receives, and obtains original useful signal by a series of conversion circuit.Like this, only changed carrier frequency, and the useful information that does not change the load of signal institute has just been realized the transmission of signal.
The following three kinds of structures of the general employing of present stage frequency mixer:
[1] adopts single-conversion needing directly to obtain the signal of frequency range,, adopt multiplier architecture inverted signal frequency by the local frequency of frequency synthesizer generation and two inputs of incoming frequency of radiofrequency signal or baseband signal.
[2] adopt double conversion, local frequency by the frequency synthesizer generation, generally be earlier through one 2/3 local frequency frequency conversion, local frequency by one 1/3 realizes down-conversion respectively again, earlier through one 1/3 local frequency frequency conversion, the local frequency by 2/3 realizes up-conversion respectively again.。
[3] adopt double conversion, and adopt dual channel mode, promptly adopt two groups of frequency mixers that are arranged in parallel, every group of frequency mixer comprises double conversion, generally is to be used in the rf analog front-end of the compatible two kinds of different frequencies of energy.
Simple for [1] general frequency conversion, but it is little to be suitable for frequency range, and also the frequency conversion error is big, does not generally reach good frequency conversion effect.
Through double conversion, generally can reach good precision for [2], but same to be suitable for frequency range little, as two or more frequency ranges, or frequency range just is difficult to realize when very big.
General [3] the kind situation that adopts of latest research achievement, this structure can well be applied in the design of rf analog front-end of compatible 802.11a/b/g agreement, reach good effect in the research of the frequency mixer of compatible 2.4GHz and two kinds of frequency ranges of 5GHz.But the compatible various protocols of mentioning in the present invention is applicable in the 0-11GHz frequency range that this structure frequency mixer is difficult to be suitable for:
1. the compatible 802.11a/b/g agreement of [3] kind situation can only be applicable to two kinds of frequency ranges of 2.4GHz and 5GHz, and the scope of compatible protocol is too narrow.
2. just adopted 4 frequency mixers when [3] kind situation adopts two frequency ranges, when frequency range increases, proportional increase frequency mixer, this just makes that the mixer architecture of design is very complicated.
Summary of the invention
The objective of the invention is for a kind of dynamic frequency mixer of configurable and reconstructable is provided, this frequency mixer can compatible 0-11GHz frequency range, different local frequencies is provided, thereby provides not frequency conversion, single-conversion and three kinds of patterns of double conversion to come the processing signals frequency.
The dynamic frequency mixer of configurable and reconstructable provided by the invention is characterized in that: it comprises up-conversion mixer, down-conversion mixer and frequency conversion Configuration Control Unit;
The frequency conversion Configuration Control Unit outputs control signals to frequency synthesizer according to the first configuration control input signals that the upper strata provides, and the output frequency that returns of receive frequency synthesizer; The second configuration control input signals that the frequency conversion Configuration Control Unit provides according to the upper strata, output frequency is offered down-conversion mixer as first local frequency, second local frequency, and export first switch controlling signal, second switch control signal to down-conversion mixer; The 3rd configuration control input signals that the frequency conversion Configuration Control Unit provides according to the upper strata, output frequency is offered up-conversion mixer as the 3rd local frequency, the 4th local frequency, and export the 3rd switch controlling signal, the 4th switch controlling signal to up-conversion mixer; The second configuration control input signals and the 3rd configuration control input signals are controlled down-conversion mixer and up-conversion mixer alternation respectively;
Down-conversion mixer comprises first low-converter, second low-converter and first switch, second switch; First low-converter and second low-converter are used for the input radio frequency signal is moved the low signal of frequency range linearly, the two the serial connection back and first switch in parallel, and second switch is in parallel with second low-converter; Two inputs of first low-converter connect first local frequency of input radio frequency signal and the output of frequency conversion Configuration Control Unit respectively, and first switch controlling signal that the frequency conversion Configuration Control Unit provides is controlled the shutoff of first switch;
Two inputs of second low-converter connect second local frequency of output of first low-converter and the generation of frequency conversion Configuration Control Unit respectively; The shutoff of the second switch control signal control second switch that the frequency conversion Configuration Control Unit provides;
Up-conversion mixer comprises first upconverter, second low-converter and the 3rd, the 4th switch;
First upconverter, second upconverter are used for and will the lower baseband signal of frequency be moved the high radiofrequency signal of frequency range linearly, the two serial connection back and the 4th switch in parallel, and the 3rd switch is in parallel with first upconverter;
Two inputs of first upconverter connect the 4th local frequency of baseband analog input signal and the output of up-conversion Configuration Control Unit respectively, and the 4th switch controlling signal that the frequency conversion Configuration Control Unit provides is controlled the shutoff of the 3rd switch;
Two inputs of second upconverter connect the output signal of first upconverter and the 3rd local frequency of up-conversion Configuration Control Unit output respectively, and the 3rd switch controlling signal that the frequency conversion Configuration Control Unit provides is controlled the shutoff of the 3rd switch.
The present invention supports various protocols, and the dynamic frequency mixer of multiple frequency conversion mode configurable and reconstructable is provided.So-called various protocols is meant, can handle the signal of all frequency ranges in the 0-11GHz, and the requirement that has covered multiple frequency band can be supported the signal transmission of various protocols such as 802.11,802.15,802.16.Multiple frequency conversion mode is meant, improve traditional single-conversion, double conversion, the down-conversion mixer structure is a difference paralleling switch on two frequency mixers, at the local frequency input of frequency mixer tandem tap respectively, the shutoff by the upper layer signal control switch realizes that not frequency conversion, down-conversion, three kinds of frequency conversion modes of secondary down-conversion move radiofrequency signal to a lower frequency band; The up-conversion mixer structure also is a difference paralleling switch on two frequency mixers, at the local frequency input of frequency mixer tandem tap respectively, the shutoff by the radiofrequency signal control switch realizes that not frequency conversion, up-conversion, three kinds of frequency conversion modes of secondary up-conversion move signal in the base band to a higher frequency band.Restructural is meant, the frequency that the local frequency that is produced by frequency synthesizer offers frequency mixer be can change to satisfy the multiple frequency range of compatible various protocols.Configurable being meant, according to the difference of frequency conversion mode, the receiver at frequency mixer place can be realized different structures with reflector.Superiority of the present invention is, different local frequencies can be provided, can provide not frequency conversion, single-conversion, three kinds of patterns of double conversion to come the processing signals frequency, it is passed in the next unit structure, realize three kinds of different frequency conversion modes, support various protocols that the processing of all frequencies in the 0-11GHz frequency range is provided, this design for the radio-frequency front-end of the more and more agreements of the compatibility that requires in the wireless communication system provides good basis.
Description of drawings
Fig. 1 is the structural representation of the dynamic frequency mixer of configurable and reconstructable of the present invention;
Fig. 2 is the workflow diagram of down-conversion mixer;
Fig. 3 is the workflow diagram of up-conversion mixer;
Fig. 4 is the concrete structure of frequency conversion Configuration Control Unit;
Fig. 5 puts restructural dynamic frequency mixer example block diagram for polygamy of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing and example.
As shown in Figure 1, be the overall structure of radio-frequency front-end frequency mixer, frequency mixer of the present invention comprises down-conversion mixer 1, up-conversion mixer 2, frequency conversion Configuration Control Unit 3.
Down-conversion mixer 1 is applied to the module of receiver front end, and it is positioned at after the low noise amplifier, and the radio-frequency input signals linearity that receives is moved a lower frequency band, passes in the base band, is convenient to Base-Band Processing, is the baseband analog output signal.
Down-conversion mixer 1 comprises first low-converter 4, second low-converter 5, switch k 11, k 12Be further describing below to down-conversion mixer 1.
The input signal of down-conversion mixer 1 is the signal process low noise amplifier that receives from antenna, is transferred to the high-frequency signal of frequency mixer after the processing such as filter.The compatible various protocols of the present invention, thus Shu Ru radiofrequency signal comprise in the 0-11GHz the signal of possible frequency range.
First low-converter 4 is identical with second low-converter, 5 operation principles, promptly input radio frequency signal linearity moved the lower signal of frequency range, first low-converter 4 input is on one side provided by the radiofrequency signal input, another input is controlled the local frequency f of generation by frequency synthesizer by frequency conversion Configuration Control Unit 3 D1Provide.By with first low-converter 4 and second low-converter 5 switch k in parallel 11Shutoff control its work.Second low-converter 5 input is on one side provided by 4 outputs of first low-converter, and another input is controlled the local frequency f of generation by frequency synthesizer by frequency conversion Configuration Control Unit 3 D2Provide.By the switch k in parallel with it 12Shutoff control its work.The multiplication function that the first down-conversion rate device 4 and the second down-conversion rate device 5 utilize nonlinear device to provide in fact realizes mixer action, promptly carries out moving of frequency with the multiplication principle.
Switch k 11, k 12Be used for selecting different down-conversion requirements.When radiofrequency signal input be one than low-band signal, upper strata control of conversion Configuration Control Unit 3 output down-conversion switch controlling signal k then D1, k D2, control switch k 11, k 12, shut k 11, radiofrequency signal does not need frequency conversion directly to pass to next stage, is the baseband analog output signal that we require; When radiofrequency signal input be the signal of an intermediate frequency band, upper strata control of conversion Configuration Control Unit 3 output down-conversion switch controlling signal k then D1, k D2, control switch k 11, k 12, disconnect k 11, shut k 12, radiofrequency signal obtains the treatable low-band signal of base band and passes to next stage through a down-conversion, is the baseband analog output signal that we require; When radiofrequency signal input be a high-frequency signal, upper strata control of conversion Configuration Control Unit 3 output down-conversion switch controlling signal k then D1, k D2, control switch k 11, k 12, disconnect k 11, k 12, radiofrequency signal obtains low frequency signal and passes to next stage through twice down-conversion, is the baseband analog output signal that we require.Frequency mixer is realized not frequency conversion, single-conversion, three kinds of frequency conversion modes of double conversion in this process, thereby structures such as the configurable realization superhet of receiver, zero intermediate frequency make full use of the advantage of different structure and avoid its deficiency.
Up-conversion mixer 2 is applied to the transmitter front-end module, and the signal of moving a high frequency band from base band input low-frequency analog signal linearity is transferred to the radio frequency output signal through handling again.
Up-conversion mixer 2 its principles and down-conversion mixer 1 are roughly the same, and up-conversion mixer 2 comprises switch k 21, k 22, first upconverter 6, second upconverter 7.Be further describing below to up-conversion mixer 2.
The baseband analog input signal is the low-band signal of digital output signal through digitized processing, digital-to-analogue conversion, filter.This invents compatible various protocols, cover the possible frequency of all frequency ranges of 0-11GHz, radiofrequency signal through upconverter output also covers the possible frequency range of 0-11GHz institute, need need judge whether to be transferred to next stage then and to obtain correct radiofrequency signal through up-conversion.
First upconverter 6, second upconverter 7 respectively with Fig. 2 in first low-converter 4, the second down-conversion rate device, 5 principles roughly the same, be a simple frequency mixer, different is, and it moves the higher radiofrequency signal of frequency range to the lower baseband signal linearity of frequency.First upconverter 6 input is on one side provided by the baseband analog input signal, and another input is controlled the local frequency f of generation by frequency synthesizer by up-conversion Configuration Control Unit 3 U2Provide, by the switch k in parallel with it 21Shutoff control its work; Second upconverter 7 input is on one side provided by first upconverter, 6 output signals, and another input is controlled the local frequency f of generation by frequency synthesizer by up-conversion Configuration Control Unit 3 U1Provide, by with first upconverter 6 and second upconverter 7 switch k in parallel 22Shutoff control its work.The multiplication function that first upconverter 6 and second upconverter 7 utilize nonlinear device to provide in fact realizes mixer action, promptly carries out moving of frequency with the multiplication principle.
Switch k 21, k 22Effect and down-conversion mixer 1 in switch k 11, k 12Operation principle identical, be used for selecting different up-conversion requirements.When penetrating low frequency frequency band signals of baseband analog input, when the external world needs reflector output radiofrequency signal to be a low frequency signal, upper layer signal control Configuration Control Unit 3 output up-conversion switch controlling signal k U1, k U2, control switch k 21, k 22, shut k 22, radiofrequency signal does not need up-conversion directly to pass to next stage, is the low radio frequency output signal that we require; When the external world needs reflector output radiofrequency signal to be an intermediate-freuqncy signal, upper layer signal control Configuration Control Unit 3 output up-conversion switch controlling signal k U1, k U2, control switch k 21, k 22, disconnect k 22, shut k 21, radiofrequency signal obtains the Mid Frequency signal and passes to next stage through a up-conversion, is the Mid Frequency radio frequency output signal that we require; When the external world needs reflector output radiofrequency signal to be a high-frequency signal, upper layer signal control Configuration Control Unit 3 output up-conversion switch controlling signal k U1, k U2, control switch k 21, k 22, disconnect k 21, k 22, radiofrequency signal obtains radio frequency frequency signal and passes to next stage through twice up-conversion, is the high band radio frequency output signal that we require.Frequency mixer is realized not frequency conversion, single-conversion, three kinds of frequency conversion modes of double conversion in this process, thereby structures such as the configurable realization superhet of reflector, zero intermediate frequency make full use of the advantage of different structure and avoid its deficiency.
The configuration control input signals that the upper strata provides is a series of digital signal, after it is input to frequency conversion Configuration Control Unit 3, is divided into three tunnel control signals.Be respectively: first, second, third configuration control input signals.They control extraneous frequency synthesizer respectively, low-converter 1 and upconverter 2 work.
Frequency conversion Configuration Control Unit 3, it provides the configuration control input signals by the upper strata, export the first configuration control input signals control frequency synthesizer output frequency then, the frequency synthesizer output frequency inputs in the frequency conversion Configuration Control Unit 3 once more, and second, third configuration control input signals control of conversion Configuration Control Unit 3 provides local frequency f for respectively down-conversion mixer 1 and up-conversion mixer 2 D1, f D2, f U1, f U2, and control signal k is provided D1, k D2, k U1, k U2The switch k that control and down-conversion mixer 1 and up-conversion mixer 2 are in parallel 11, k 12, k 21, k 22Shutoff.Thereby control down-conversion mixer 1 and up-conversion mixer 2 make it can realize dynamic configurable frequency conversion.
Fig. 2 is the workflow diagram of down-conversion mixer 1, the input radio frequency signal, can frequency conversion Configuration Control Unit 3 judgement input radio frequency signals directly be delivered in the baseband analog output signal and handle, if can, then directly radiofrequency signal is delivered to the baseband analog output signal, if it is not all right, through a down-conversion, continue then by frequency conversion Configuration Control Unit 3, judge signal frequency, require directly to be delivered to the baseband analog output signal if reach low-frequency range, otherwise, then down-conversion once more obtains low-band signal and transfers in the baseband analog output signal.
Fig. 3 is the workflow diagram of up-conversion mixer 2, base band input analog signal, frequency conversion Configuration Control Unit 3 judges that can import baseband signal directly deliver to the processing of radiofrequency signal delivery outlet, if can, then directly radiofrequency signal is delivered to radiofrequency signal output, if it is not all right, through a up-conversion, continue then to judge signal frequency by frequency conversion Configuration Control Unit 3, directly be delivered to radiofrequency signal output if reach the radio frequency band requirement, otherwise then up-conversion once more obtains radio signal transmission to radiofrequency signal output.
Fig. 4 is the concrete structure of Configuration Control Unit 3.Configuration Control Unit 3 mainly is made up of down-conversion Configuration Control Unit 21 and up-conversion Configuration Control Unit 22.Wherein down-conversion Configuration Control Unit 21 is made up of down-conversion parameter storage unit 211 and down-conversion controller 212, and up-conversion Configuration Control Unit 22 is made up of up-conversion parameter storage unit 221 and up-conversion controller 222.Be detailed description below to Configuration Control Unit 3.
Down-conversion Configuration Control Unit 21, it comprises down-conversion controller 212, down-conversion parameter storage unit 211.When receiver operation, 21 work of down-conversion Configuration Control Unit, in the up-conversion Configuration Control Unit 3, this signal is divided into three road signals, first, second, third configuration control input signals.The first configuration control input signals inputs in the frequency synthesizer, the frequency that the output of control frequency synthesizer is suitable, this signal frequency inputs in the down-conversion Configuration Control Unit 21, and the second configuration control input signals control down-conversion controller 212 distributes local frequency f by down-conversion controller 212 D1, f D2Give first low-converter 4 and second low-converter 5 respectively, switch controlling signal k is provided for simultaneously low-converter 1 D1, k D2, switch controlling signal k D1, k D2Control down-conversion switch k 11, k 12Shutoff.Thereby control down-conversion mixer 1 makes it can realize dynamic frequency-conversion.The turn off process of down-conversion parameter storage unit 211 record switches in this process, and frequency synthesizer output frequency data, thus feed back in the controller of upper strata.
When the low upper strata decision of input radio frequency signal frequency does not need frequency conversion, down-conversion Configuration Control Unit 21 gives frequency synthesizer as input signal by the upper-layer configured control signal input first configuration control input signals, this signal controlling frequency synthesizer output frequency, the second configuration control input signals control down-conversion controller 212 is distributed to first low-converter, 4 local frequency f D1With second low-converter, 5 local frequency f D2, this moment f D1, f D1Be the zero-frequency local frequency, export down-conversion switching signal k simultaneously D1, k D2, shut switch k 11, k 12, radiofrequency signal does not need frequency conversion directly to pass to next stage, is the baseband analog output signal that we require; When radiofrequency signal input be the signal demand single-conversion of a Mid Frequency time, down-conversion Configuration Control Unit 21 gives frequency synthesizer as input signal by the upper-layer configured control signal input first configuration control input signals, this signal controlling frequency synthesizer output frequency, the second configuration control input signals control down-conversion controller 212 is distributed to first low-converter, 4 local frequency f D1, second low-converter, 5 local frequency f D2, this moment f D1Be a suitable intermediate-freuqncy signal, f D2Be zero frequency signal, export down-conversion switching signal k simultaneously D1, k D2, disconnect k 11, shut k 12, radiofrequency signal passes to next stage through a down-conversion, is the baseband analog output signal that we require; When radiofrequency signal input be a high-frequency signal demand double conversion time, down-conversion Configuration Control Unit 21 gives frequency synthesizer as input signal by the input first configuration control input signals of upper-layer configured control signal, this signal controlling frequency synthesizer output frequency, the second configuration control input signals control down-conversion controller 212 is distributed to first low-converter, 4 local frequency f D1, second low-converter, 5 local frequency f D2, this moment f D2, f D2Be a suitable intermediate-freuqncy signal, export down-conversion switching signal k simultaneously D1, k D2, disconnect k 11, k 12, radiofrequency signal passes to next stage through twice down-conversion, is the baseband analog output signal that we require.The situation of down-conversion parameter storage unit 211 record switch on and off processes and frequency synthesizer output frequency is preserved in this process.
Up-conversion Configuration Control Unit 22, it comprises up-conversion controller 222, up-conversion parameter storage unit 221.When reflector is worked, 22 work of up-conversion Configuration Control Unit, down-conversion Configuration Control Unit 21 is not worked.Upper-layer configured control signal input signal is to Configuration Control Unit 3, and this signal is divided into three road signals, first, second, third configuration control input signals.The first configuration control input signals inputs in the frequency synthesizer, the frequency that the output of control frequency synthesizer is suitable, this signal frequency inputs in the up-conversion Configuration Control Unit 22, and the 3rd configuration control input signals control up-conversion controller 222 distributes local frequency f by up-conversion controller 222 U1, f U2Give first upconverter 7 and second upconverter 6 respectively, switch controlling signal k is provided for simultaneously upconverter 2 U1, k U2, switch controlling signal k U1, k U2Control up-conversion switch k 22, k 21Shutoff.Thereby control up-conversion mixer 2 makes it can realize dynamic up-conversion.The turn off process of upconverter 221 record switches in this process, and frequency synthesizer output frequency data, thus feed back in the controller of upper strata.
When the upper strata needs the frequency of reflector emission lower, up-conversion Configuration Control Unit 22 gives frequency synthesizer as input signal by the upper-layer configured control signal input first configuration control input signals, this signal controlling frequency synthesizer output frequency, the 3rd configuration control input signals control up-conversion controller 222 is distributed to first upconverter, 6 local frequency f U2With second upconverter, 7 local frequency f U1, this moment f U1, f U2Be the zero-frequency local frequency, export up-conversion switch controlling signal k simultaneously U1, k U2, shut switch k 21, k 22, the baseband analog input signal does not need frequency conversion directly to pass to next stage, is the low frequency radio frequency output signal that we require; When the upper strata needs the frequency of reflector emission to be intermediate-freuqncy signal, up-conversion Configuration Control Unit 22 gives frequency synthesizer as input signal by the upper-layer configured control signal input first configuration control input signals, this signal controlling frequency synthesizer output frequency, the 3rd configuration control input signals control up-conversion controller 222 is distributed to first upconverter, 6 local frequency f U2Second upconverter, 7 input local frequency f U1, this moment f U1Be a suitable intermediate-freuqncy signal, f U2Be zero frequency signal, export up-conversion switch controlling signal k simultaneously U1, k U2, disconnect k 22, shut k 21, the baseband analog input signal passes to next stage through a up-conversion, is the intermediate frequency radio frequency output signal that we require; When the upper strata needs the frequency of reflector emission to be high-frequency signal, up-conversion Configuration Control Unit 22 gives frequency synthesizer as input signal by the upper-layer configured control signal input first configuration control input signals, this signal controlling frequency synthesizer output frequency, the 3rd configuration control input signals control up-conversion controller 222 is distributed to first upconverter, 6 local frequency f U2Second upconverter, 7 input local frequency f U1, this moment f U1, f U2Be a suitable intermediate-freuqncy signal, export up-conversion switch controlling signal k simultaneously U1, k U2, disconnect k 21, k 22, the baseband analog input signal passes to next stage through twice up-conversion, is the high-frequency radio frequency output signal that we require.Up-conversion parameter storage unit 221 record switch on and off process and frequency synthesizer output frequency data are preserved in this process.
Example:
As shown in Figure 5, the example of frequency mixer application of the present invention is:
This structure is the structure that is applicable to the radio-frequency (RF) transceiver AFE (analog front end), and down-conversion mixer 1 forms paralleling switch k on the Gilbert cell of two series connection by two NMOS Gilbert cell series connection 11, paralleling switch k on second Gilbert cell 12, switch k wherein 11And k 12Equal complementary switchs of forming by NMOS and PMOS.The input of first Gilbert cell is by the local frequency f of radiofrequency signal and 3 outputs of frequency conversion Configuration Control Unit D1Provide, the input of second Gilbert cell is by the local frequency f of the output and 3 outputs of frequency conversion Configuration Control Unit of first Gilbert cell D2Provide.
The radiofrequency signal that antenna receives comprises the possible frequency range of institute, and different frequency ranges needs different frequency conversion mode and different frequency conversion frequencies.Receiver is from antenna receiving signal, through filter, low noise amplifier carries out amplification filtering to the radiofrequency signal that receives from antenna, and guarantee that low noise amplifier has the good linearity, low-noise factor, signal after low noise amplifier amplifies is through automatic gain amplifier, provide different gains at each frequency range, obtain the radiofrequency signal of certain amplitude, the radiofrequency signal of coming out from automatic gain amplifier enters down-conversion mixer 1, when radiofrequency signal input be one than low-band signal, upper strata control of conversion Configuration Control Unit 3 output down-conversion switch controlling signal k then D1, k D2, this moment k D1Be high level, k D2Be low level, control switch k 11, k 12, shut k 11, radiofrequency signal does not need frequency conversion directly to pass to next stage, is the baseband analog output signal that we require; When radiofrequency signal input be the signal of an intermediate frequency band, upper strata control of conversion Configuration Control Unit 3 output down-conversion switch controlling signal k then D1, k D2, this moment k D1Be low level, k D2Be high level, control switch k 11, k 12, disconnect k 11, shut k 12, radiofrequency signal obtains the treatable low-band signal of base band and passes to next stage through a down-conversion, promptly obtains the baseband analog output signal that we require; When radiofrequency signal input be a high-frequency signal, upper strata control of conversion Configuration Control Unit 3 output down-conversion switch controlling signal k then D1, k D2, this moment k D1, k D2Be low level, control switch k 11, k 12, disconnect k 11, k 12, radiofrequency signal obtains low frequency signal and passes to next stage through twice down-conversion, is the baseband analog output signal that we require.Transform by this a series of circuit like this, only change the carrier frequency of radiofrequency signal, and do not change the useful information of signal institute load, realized the transmission of signal.Be input in the base band after the low-band signal process low pass filter filtering of down-conversion mixer 1 output, to carry out next step digital processing.
Up-conversion mixer 2 forms paralleling switch k on the Gilbert cell of two series connection by a NMOS Gilbert cell and a PMOS Gilbert cell series connection 22, paralleling switch k on second Gilbert cell 21, switch k wherein 21And k 22Equal complementary switchs of forming by NMOS and PMOS.The input of first Gilbert cell is by the local frequency f of baseband signal and 3 outputs of frequency conversion Configuration Control Unit U2Provide, the input of second Gilbert cell is by the local frequency f of the output and 3 outputs of frequency conversion Configuration Control Unit of first Gilbert cell U1Provide.
Equally at reflector, be input in the base band through the signal after the digital processing, because the original incoming frequency of antenna is in very wide frequency range, the signal that reflector is launched after a series of the processing comprises low-frequency range, Mid Frequency even the high frequency band signal of frequency ratio broad, low pass filter is handled the low frequency signal of base band, up-conversion mixer 2 received signals, when penetrating low frequency frequency band signals of baseband analog input, when the external world needs reflector output radiofrequency signal to be a low frequency signal, upper layer signal control Configuration Control Unit 3 output up-conversion switch controlling signal k U1, k U2, this moment k U1Be high level, k U2Be low level, control switch k 21, k 22, shut k 22, radiofrequency signal does not need up-conversion directly to pass to next stage, is the low radio frequency output signal that we require; When the external world needs reflector output radiofrequency signal to be an intermediate-freuqncy signal, upper layer signal control Configuration Control Unit 3 output up-conversion switch controlling signal k U1, k U2, this moment k U1Be low level, k U2Be high level, control switch k 21, k 22, disconnect k 22, shut k 21, radiofrequency signal obtains the Mid Frequency signal and passes to next stage through a up-conversion, promptly obtains the Mid Frequency radio frequency output signal that we require; When the external world needs reflector output radiofrequency signal to be a high-frequency signal, upper layer signal control Configuration Control Unit 3 output up-conversion switch controlling signal k U1, k U2, this moment k U1, k U2Be low level, control switch k 21, k 22, disconnect k 21, k 22, radiofrequency signal obtains radio frequency frequency signal and passes to next stage through twice up-conversion, is the high band radio frequency output signal that we require.Up-conversion mixer 2 will be loaded with useful mixes baseband signals and export to intermediate frequency or high-frequency radio frequency signal like this.Pass through filter again from the radiofrequency signal of up-conversion mixer 2 outputs, interference signal is leached, obtain the radiofrequency signal in the useful frequency range, pass through power amplifier then, realization is amplified the radio frequency signal power, promptly increase the amplitude of radiofrequency signal on demand, the signal that obtains so just can pass to antenna effectively.Therefore, this reflector just avoided output because the difficult problem that the low frequency signal wavelength long transmitting antenna that causes can't mate and better utilization frequency spectrum resource.
Optimize embodiment though this explanation is of choosing, the professional and technical personnel should understand, and the present invention is not limited to above-mentioned example, but the situation that suitable more multiband, polygamy are put.

Claims (2)

1. the dynamic frequency mixer of a configurable and reconstructable, it is characterized in that: it comprises up-conversion mixer (2), down-conversion mixer (1) and frequency conversion Configuration Control Unit (3);
Frequency conversion Configuration Control Unit (3) outputs control signals to frequency synthesizer according to the first configuration control input signals that the upper strata provides, and the output frequency that returns of receive frequency synthesizer; Frequency conversion Configuration Control Unit (3) offers down-conversion mixer (1) as the first local frequency (f according to the second configuration control input signals that the upper strata provides with output frequency D1), the second local frequency (f D2), and export the first switch controlling signal (k D1), second switch control signal (k D2) to down-conversion mixer (1); Frequency conversion Configuration Control Unit (3) offers up-conversion mixer (2) as the 3rd local frequency (f according to the 3rd configuration control input signals that the upper strata provides with output frequency U1), the 4th local frequency (f U2), and export the 3rd switch controlling signal (k U1), the 4th switch controlling signal (k U2) to up-conversion mixer (2); The second configuration control input signals and the 3rd configuration control input signals are controlled down-conversion mixer (1) and up-conversion mixer (2) alternation respectively;
Down-conversion mixer (1) comprises first low-converter (4), second low-converter (5) and the first switch (k 11), second switch (k 12); First low-converter (4) and second low-converter (5) are used for the input radio frequency signal is moved the low signal of frequency range linearly, the two the serial connection back and the first switch (k 11) parallel connection, second switch (k 12) in parallel with second low-converter (5); Two inputs of first low-converter (4) meet the first local frequency (f of input radio frequency signal and frequency conversion Configuration Control Unit (3) output respectively D1), the first switch controlling signal (k that frequency conversion Configuration Control Unit (3) provides D1) the control first switch (k 11) shutoff;
Two inputs of second low-converter (5) meet the second local frequency (f of first low-converter (4) output and frequency conversion Configuration Control Unit (3) generation respectively D2); Second switch control signal (the k that frequency conversion Configuration Control Unit (3) provides D2) control second switch (k 12) shutoff;
Up-conversion mixer (2) comprises first upconverter (6), second low-converter (7) and the 3rd, the 4th switch (k 21, k 22);
First upconverter (6), second upconverter (7) are used for and will the lower baseband signal of frequency be moved the high radiofrequency signal of frequency range linearly, the two serial connection back and the 4th switch (k 22) parallel connection, the 3rd switch (k 21) in parallel with first upconverter (6);
Two inputs of first upconverter (6) meet the 4th local frequency (f of baseband analog input signal and up-conversion Configuration Control Unit (3) output respectively U2), the 4th switch controlling signal (k that frequency conversion Configuration Control Unit (3) provides U2) control the 3rd switch (k 21) shutoff;
Two inputs of second upconverter (7) meet the output signal of first upconverter (6) and the 3rd local frequency (f of up-conversion Configuration Control Unit (3) output respectively U1), the 3rd switch controlling signal (k that frequency conversion Configuration Control Unit (3) provides U1) control the 3rd switch (k 21) shutoff.
2. the dynamic frequency mixer of configurable and reconstructable according to claim 1, it is characterized in that: frequency conversion Configuration Control Unit (3) comprises down-conversion Configuration Control Unit (21) and up-conversion Configuration Control Unit (22);
Down-conversion Configuration Control Unit (21) is made up of down-conversion parameter storage unit (211) and down-conversion controller (212), and up-conversion Configuration Control Unit (22) is made up of up-conversion parameter storage unit (221) and up-conversion controller (222);
Down-conversion parameter storage unit (211) is used to store the first switch (k 11), second switch (k 12) interrupting process and frequency synthesizer output frequency data; Down-conversion controller (212) is exported first, second switch controlling signal (k according to the second configuration control input signals D1, k D2), the first switch controlling signal (k D1) control first low-converter (4) work or dormancy; Second switch control signal (k D2) control second low-converter (5) work or dormancy;
Up-conversion parameter storage unit (221) is used to store the 3rd, the 4th switch (k 21, k 22) interrupting process and frequency synthesizer output frequency data; Up-conversion controller (222) is exported the 3rd, the 4th switch controlling signal (k according to the 3rd configuration control input signals U1, k U2), the 3rd switch controlling signal (k U1) control first upconverter (6) work or dormancy, the 4th switch controlling signal (k U2) control second upconverter (7) work or dormancy.
CN200810047029XA 2008-03-07 2008-03-07 A configurable and reconstructable dynamic frequency mixer CN101242158B (en)

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